English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We apply the non-equilibrium functional renormalization group approachtreating flow of the electronic self-energies, to describe local magneticmoments formation and electronic transport in a quadruple quantum dot (QQD)ring, coupled to leads, with moderate Coulomb interaction on the quantum dots.We find that at zero temperature depending on parameters of the QQD system theregimes with zero, one, or two almost local magnetic moments in the ring can berealized, and the results of the considered approach in equilibrium agreequalitatively with those of more sophisticated fRG approach treating also flowof the vertices. It is shown that the almost formed local magnetic moments,which exist in the equilibrium, remain stable in a wide range of bias voltagesnear equilibrium. The destruction of the local magnetic moments with increasingbias voltage is realized in one or two stages, depending on the parameters ofthe system; for two-stage process the intermediate phase possesses fractionalmagnetic moment. We present zero-temperature results for current-voltagedependences and differential conductances of the system, which exhibit sharpfeatures at the transition points between different magnetic states. Theoccurrence of interaction induced negative differential conductance phenomenonis demonstrated and discussed. For one local moment in the ring and finitehopping between the opposite quantum dots, connected to the leads, we findsuppression of the conductance for one of the spin projections ininfinitesimally small magnetic field, which occurs due to destructiveinterference of different electron propagation paths and can be used inspintronic devices.

physical review. b./physical review. b

Local magnetic moments and electronic transport in closed loop quantum  dot systems: a case of quadruple quantum dot ring at and away from  equilibrium